crouton: Hard freeze on Chromebook Flip after switching to XFCE after sleep

$ sudo edit-chroot -all
name: xenial
encrypted: no
Entering /mnt/stateful_partition/crouton/chroots/xenial...
crouton: version 1-20160627183059~master:e3c0a690
release: xenial
architecture: armhf
xmethod: xorg
targets: keyboard,extension,xfce-desktop
host: version 8350.38.0 (Official Build) beta-channel veyron_minnie 
kernel: Linux localhost 3.14.0 #1 SMP PREEMPT Tue Jun 21 21:43:55 PDT 2016 armv7l armv7l armv7l GNU/Linux
freon: yes
Not unmounting /mnt/stateful_partition/crouton/chroots/xenial as another instance is using it.

Please describe your issue:

After starting XFCE with sudo startxfce4, I can switch back and forth between ChromeOS and XFCE just fine, unless I suspend the device in between. In this case, attempting to switch to XFCE triggers a hard freeze, just the cursor on black screen. Need to hold power for 10s to hard-reset.

If known, describe the steps to reproduce the issue:

• Launch XFCE4 with sudo startxfce4.
• Switch to XFCE and back to ChromeOS.
• Suspend the device by closing the lid.
• Open it again.
• Switch to XFCE -> hard freeze.